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Finding the Fourth Proportional to 70.75, 105.30 and 69.04

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Solution

The fourth proportional to 70.75, 105.30 and 69.04 is: 102.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.75 : 105.30 = 69.04 : x
  2. Step 2: Convert to fraction form
    70.75/105.30 = 69.04/x
  3. Step 3: Cross multiply
    70.75x = 105.30 × 69.04
  4. Step 4: Simplify right side
    70.75x = 7,269.91
  5. Step 5: Solve for x
    x = 7,269.91/70.75
  6. Step 6: Final answer
    x = 102.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.